Design method of connecting column for reducing temperature rise at overlap position between electric bus bars

Abstract

The invention discloses a design method of a connecting column for reducing temperature rise at an overlap position between electric bus bars, belongs to the field of power equipment, and particularly relates to a design method of a connecting column. The design method of the connecting column disclosed by the invention comprises the following steps: providing first columnar parts which are in interference fit with prefabricated holes in the electric bus bars, wherein the first columnar parts are electrically conductive; coaxially arranging second columnar parts which are electrically conductive in the first columnar parts; making the first columnar parts be in interference fit with the second columnar parts; and making thermal expansion coefficients of the second columnar parts be greater than the thermal expansion coefficients of the first columnar parts. The connecting column made by the design method disclosed by the invention has the beneficial effects that 1, more electric conduction area is formed at a same overlap length, so that the current density is lowered, and low temperature rise of the bus bars is realized; 2, a using quantity of the bus bars is reduced, and resources are saved; 3, electric clearances or space distances are increased, and the electrical safety of equipment is enhanced; and 4, arrangement widths of the bus bars are reduced, so that space occupied by the bus bars can be reduced.

Description

technical field [0001] The invention relates to the field of power equipment, in particular to a design method for a connecting column of a power busbar. Background technique [0002] In the field of power distribution, the connection of two power busbars is usually overlapped and then fastened with bolts. Such as figure 1 In the upper half of the busbar, this connection method needs to overlap the two busbars by a certain length, so that the current density of the contact surface can be maintained within a certain range, so that the temperature rise at the connection can meet the relevant standards. In order to reduce the temperature rise of power equipment, it is usually necessary to increase the overlapping length of the busbars to increase the contact area, thereby reducing the current density of the contact surface, and finally making the equipment have a lower temperature rise. Increasing the overlapping length will increase the amount of busbars used, thereby increa...

AI Technical Summary

Problems solved by technology

Increasing the overlapping length will increase the amount of busbars, which will increase the manufacturing cost of the equipment

The bolts used for fastening will reduce the electrical clearance or phase-to-phase distance between the busbars. In order to keep the electrical clearance or phase-to-phase distance unchanged, the distance between the busbars needs to be increased, and increasing the distance between the busbars will inevitably lead to the occupation of the busbars. bigger space

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